One of the criteria used by Taichi Kato in his paper is:
"the presence of early superhumps (reflecting the 2:1 resonance) and long or multiple rebrightenings are the best distinguishing properties of WZ Sge-type dwarf novae."
I suspect the reason for not including this star is that such early superhaumps have not been detected (yet)
We must continue to observe (when weather permits!!!!!!)
Kind regards
Stephen [HSP]